Fix lint errors
Try to solve build error "Manifest merger failed : uses-sdk:minSdkVersion 8 cannot be smaller than version L declared in library com.android.support:support-v4:21.0.0-rc1" with android-support-library
http://stackoverflow.com/questions/24438170/manifest-merger-failed-uses-sdkminsdkversion-14
Merge pull request #119 from indication/fix_ci_error

Fix ci error